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help for ^allcross^ (statalist distribution Oct 1, 1997)
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All cross-products and squares
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^allcross^ varlist
Description
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^allcross^ creates variables corresponding to the cross-products and squares of
the variables in varlist. The names of the created variables are formed by
concatenating the names in varlist involved in the cross-product term. Since
variable names are limited to 8 characters an error occurs if varlist contains
variables with names longer than 4 characters.
Examples
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. ^allcross x1 x2 x3^
. ^allcross x1-x4 age y1-y3^
Note
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The user should be aware that when ^allcross^ is given a large number of
variables in the varlist that it will end up creating a very large number of
variables in the user's working data set. For example, if the user has 30
variables in her data set and executes ^allcross _all^, she will then have
30+(30*31)/2 = 495 variables in her data set.
Author
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Kenneth Higbee
Stata Corp.
khigbee@@stata.com